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Table 5 Sensitivity analysis of association between exposure to outdoor air pollutants during pregnancy with birth anthropometrics (restricted to those with GA ≥37 weeks)

From: The effect of exposure to traffic related air pollutants in pregnancy on birth anthropometry: a cohort study in a heavily polluted low-middle income country

 

Linear regression coefficients (95% confidence interval)

Birth weight (g) (n = 319)

Birth length (mm) (n = 319)

PM2.5

 Crude

−48.19 (− 137.14; 40.4)

− 2.75 (−7.01; 1.51))

 Model 1

−36.42 (− 123.52; 50.68)

− 2.46 (− 6.71; 1.80)

 Model 2

−65.09 (− 153.42; 23.23)

− 2.86 (− 7.24; 1.52)

Soot

 Crude

−36.60 (−99.67; 26.46)

− 3.55 (− 6;55; − 0.55)*

 Model 1

− 36.58 (− 98.11; 24.95)

−3.56 (− 6;54; − 0.57)*

 Model 2

− 39.15 (− 100.70; 22.41)

−3.78 (− 6;79; − 0.76)*

NOx

 Crude

−22.29 (− 74.87; 30.29)

−2.03 (− 4.42; 0.37)

 Model 1

− 24.97 (− 76.55; 29.30)

−2.23 (− 4.63; 0.17)

 Model 2

−38.11 (− 90.46; 14.22)

− 2.93 (− 5.38; − 0.48)*

NO2

 Crude

− 21.49 (− 75.15; 31.17)

−1.97 (− 5.03; 1.09)

 Model 1

− 24.03 (− 75.05; 30.99)

−2.01 (− 5.08; 1.07)

 Model 2

−37.48 (− 90.44; 15.48)

− 2.50 (− 5.66; 0.65)

  1. All effect estimates correspond to interquartile increase of each air pollutant i.e. every 7.14 μg/m3 for PM2.5, 0.75 × 10− 5 per m for soot, 4.68 μg/m3 for NOx, and 3.74 μg/m3 for NO2
  2. Model 1: Adjusted for gestational age
  3. Model 2: Adjusted for gestational age, parity, SES, mother’s working status, mother’s age at pregnancy, delta BMI during pregnancy, infant’s sex, passive smoking exposure, pregnancy complication
  4. *p < 0.05